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Proc. Natl. Acad. Sci. USA Vol. 93, pp. 49624967, May 1996
 

Summary: Proc. Natl. Acad. Sci. USA
Vol. 93, pp. 4962­4967, May 1996
Neurobiology
Electrical microstimulation suggests two different forms of
representation of head-centered space in the intraparietal
sulcus of rhesus monkeys
(parietal cortex eye movements saccades)
P. THIER* AND R. A. ANDERSEN
*Neurologische Universita¨tsklinik, Sektion fu¨r Visuelle Sensomotorik, Tu¨bingen, 72076 Tu¨bingen, Germany; and Massachusetts Institute of Technology,
Cambridge, MA 02139
Communicated by John J. Hopfield, California Institute of Technology, Pasadena, CA, January 16, 1996 (received for review April 28, 1995)
ABSTRACT We examined the effects of eye position on
saccades evoked by electrical stimulation of the intraparietal
sulcus (IPS) of rhesus monkeys. Microstimulation evoked
saccades from sites on the posterior bank, floor, and the
medial bank of the IPS. The size and direction of the eye
movements varied as a function of initial eye position before
microstimulation. At many stimulation sites, eye position
affected primarily the amplitude and not the direction of the
evoked saccades. These ``modified vector saccades'' were char-

  

Source: Andersen, Richard - Division of Biology, California Institute of Technology

 

Collections: Biology and Medicine